Revert 85666 - Consolidate ShouldUseNativeFrame/AlwaysUseNativeFrame/UseNativeFrame spaghetti.

chrome/browser/external_tab_container_win.cc

Index: chrome/browser/external_tab_container_win.cc
===================================================================
--- chrome/browser/external_tab_container_win.cc	(revision 85701)
+++ chrome/browser/external_tab_container_win.cc	(working copy)
@@ -932,14 +932,10 @@
 }
 
 // ExternalTabContainer instances do not have a window.
-views::Window* ExternalTabContainer::GetContainingWindow() {
+views::Window* ExternalTabContainer::GetWindow() {
   return NULL;
 }
 
-const views::Window* ExternalTabContainer::GetContainingWindow() const {
-  return NULL;
-}
-
 bool ExternalTabContainer::AcceleratorPressed(
     const views::Accelerator& accelerator) {
   std::map<views::Accelerator, int>::const_iterator iter =